Electrical protective device



March 19, 1929. l s PARSONS- 1,705,676

ELECTRICAL PROTECTIVE DEVICE Filed Feb. 1, 1924 WITNESSES: INVENTOR 1% flrsw Y 1/06 J. Dania/25.

M}. M'X- BY Patented Mar. 19, 1 929.

UNITED. STATES PATENT OFF 1,705,676 ICE.

JOHN S. PARSONS, F WILKINSBURG, IllEN'NSYIN'ANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A. CORPORATION 'OF PENNSYLVANIA.

nnnc'rmcu. PRbTEGTIVE' DEVICE.-

Application filed February 1, 1924. Serial No. 680,018.

' videa relay that shall be initially operated by a'coil of relatively low resistance and that shall be held in its operative position by a coil of relatively high resistance.

A further obj cct of my invention is to pro-' vide a relay mechanism having a contact member that shall be actuated to its closed position to complete a holding circuit when the relay is actuated.

In the operation of distribution circuits, conditions frequently arise under which it is desirable to commence certain operations when a relatively low voltage is impressed upon the transmission line in order that such operations may be properly completed before the normaloperating voltage is impressed upon the distribution circuit. An example of this condition is that of a periodically reclosing circuit interrupter that operates in accordance with the return of voltageto a transmission line after the voltage collapses incident to a short-circuit by reason of the clearance of the short-circuit. The structural details of a relay suitable for these purposes are shown and described in co-pending application of L. N. Crichton, Serial No. 672,828, filed November 5, 1923, and assigned to the Westinghouse Electric & Manufacturing Company.

The single figure of the accompanying drawing is a diagrammatic view of apparatus and circuits embodying my invention.

My invention comprises, in general, a

transmission line 1, a voltage relay 2 and a.

controlling circuit 3 extending to any suitable tnanslatin device (not shown). 'While I have shown t e circuit 1 as a single-phase circuit, it is obvious that my relay may be used in connection with any polyphase circuit.

The voltage relay 2 comprises a shunt coil 4 of relatively low resistance and a holding coil 5 of relatively high resistance, pairs of stationary contact members 6 and 79nd a bell-crank lever 8 that is pivotally mounted at 9. One arm of the bell-crank lever 8 carries insulating strips 11 and 12 on opposite sides of which are mounted a pair of bridging contact members 13 and 14. The 'bridg- 1 ing contact member 13 co-operates with the stationary contact members 7 in the de-energized position of the relay, and the bridging contact member 14 co-operates with the stationary contact members 6 in the operative position of the relay. The position of the several parts of my relay shown in the drawing correspond to the de-energized position of the relay. Under these conditions, the coil 4 is bridged across the conductors of the circuit 1 and the coil 5 is short-circuited by the contact members 7 and 13.

A spring 15 normally biases the lever 8 to its de-energized position. A link mechanism 16 connects one arm of the lever 8 with the core or armature member 17 of the holding coil 5. A. plunger 18 is actuated into engagement with the lever 8 by the core member 19 of the coil 4.

When voltage is impressed upon the circuit 1, the coil 4 is energized. When the current traversing the coil 4 reaches a predetermined value, the core member 19 moves up wardly to strike the .plunger 18 which, in turn, causes the lever 8 to turn against the action of the spring 15. This movement results in the interruption of the above-described circuit between the stationary contact members 7 and the bridging contact member 13. Coils 4 and 5 are thereupon energized by a circuit extending from one of the conductors of the circuit 1 through the coils 4 and 5 in series, and the coil 5 is sufficiently energized to retain the lever 8 in its adto the connected translating devices (not shown). Since the contact member and arm 8 are independently movable with respect to the armature member 19 of the coil 4, they are held in the actuated position even after the armature member is restored to normal.

Upon the de-energization of the relay 2,

the coil 5 becomes de-energized, permitting 7 normal operating voltage without danger of subsequently destroying the low-voltage operating coil when it is subjected to the normal operating voltage. In practice, I may so design my relay that the initial operating coil Wlll operate at 10 volts, while the normal operating voltage may be 120 volts.

While I have shown and described a specific embodiment of my invention, it is to be understood that such changes and arrangements may be made in the apparatus as here shown as fall within the scope of the appended claims.

I claim as my invention: H

1. A voltage rela adapted to operate at a voltage considera 1y lower than the normal applied voltage comprising a shunt windin of relatively low resistance, a magnetizab e armature member therefor, an auxiliary holding winding of relatively high resistance connected in series relation with said shunt winding, a second magnetizable armature member therefor, a low-resistance shunt for said holding winding, a movable contact member secured to the second armature member and arranged in the path of travel of the first-mentioned armature memher but independentl movable with respect thereto, and means w ereby the actuation of said movable member opens said low-resistance shunt to render said holding winding effective,

2. A voltage relay adapted to operate at a voltage considerably lower than the normal applied voltage comprising a shunt winding of relatively low-resistance, a magnetizable armature therefor, an auxiliary holding winding of relatively high resistance, a second magnetizable armature member therefor, a movable contact member having initial and operated positions, said contact member being secured to the second armature member and arranged in the path of travel of the first-mentioned armature member but independently movable with respect thereto, and means for rendering said holding winding efiective and said shunt winding substantially de-energized when said contact member is actuated from the initial to the operated position.

In testimony whereof, I have hereunto subscribed my name this 28th day of January, 1924.

JOHN S. PARSONS. 

